Can Not Ping By Name

  • Thread starter Thread starter Peter
  • Start date Start date
P

Peter

We have installed SonicWall Firewall and when I connect through VPN I can not connect to the Exchange server through Outlook

When I try to create a profile
On "check names" prompt in Services, server and mailbox are found sometimes
but not allways. When not found it says "The name could not be resolved."
When the mailbox and server are found, it never really connects to the
mailbox...getting a message like 'folder not available'.

I also can not ping any computer including the Exchange server by name, but I can ping any computer including the Exchange server by IP address (This is only through VPN)

The Exchange runs on Windows 2003 SBS.

What can I check to fix this problem?
 
We have installed SonicWall Firewall and when I connect through VPN I can not connect to the Exchange server through Outlook

When I try to create a profile
On "check names" prompt in Services, server and mailbox are found sometimes
but not allways. When not found it says "The name could not be resolved."
When the mailbox and server are found, it never really connects to the
mailbox...getting a message like 'folder not available'.

I also can not ping any computer including the Exchange server by name, but I can ping any computer including the Exchange server by IP address (This is only through VPN)

The Exchange runs on Windows 2003 SBS.

What can I check to fix this problem?
Click to expand...

Peter,

Make sure there's no firewall packaged with the VPN client.
<http://nitecruzr.blogspot.com/2005/10/irregularities-in-workgroup-visibility.html>
http://nitecruzr.blogspot.com/2005/10/irregularities-in-workgroup-visibility.html

What's your DNS server? Does it have an entry for the Exchange server?
<http://nitecruzr.blogspot.com/2005/05/windows-xp-on-nt-domain.html>
http://nitecruzr.blogspot.com/2005/05/windows-xp-on-nt-domain.html
 
I don's see any settings for the Firewall in the VPN client

DNS server is the same physical server as the Exchange , Windows 2003 SBS
 
I don's see any settings for the Firewall in the VPN client

DNS server is the same physical server as the Exchange , Windows 2003 SBS
Click to expand...

Peter,

Speaking from gut feel, about 50% of the problems here, that are resolved
simply, turn out to be firewall related. Maybe 25% are LSP / Winsock / TCP/IP
corruption. The other 25% are miscellaneous.

With your symptoms, combined with the VPN involvement, a firewall becomes more
than 50% likely. "Cannot ping by name but can ping by IP address" suggests a
DNS server issue. DNS server issues can, again, be caused by firewall problems.

Most common network problems:
<http://nitecruzr.blogspot.com/2005/10/irregularities-in-workgroup-visibility.html>
http://nitecruzr.blogspot.com/2005/10/irregularities-in-workgroup-visibility.html

Firewall issues:
<http://nitecruzr.blogspot.com/2005/05/your-personal-firewall-can-either-help.html>
http://nitecruzr.blogspot.com/2005/05/your-personal-firewall-can-either-help.html

Of the problems here that are NOT resolved simply (as above), you have to do
some work. I can advise you, but you gotta do the leg work.

Network problem solving - general advice:
<http://nitecruzr.blogspot.com/2005/08/solving-network-problems-tutorial.html>
http://nitecruzr.blogspot.com/2005/08/solving-network-problems-tutorial.html

Network problem solving - Network Neighborhood issues:
<http://nitecruzr.blogspot.com/2005/05/troubleshooting-network-neighborhood.html>
http://nitecruzr.blogspot.com/2005/05/troubleshooting-network-neighborhood.html

When you say "I cannot ping", you mean your computer, right? I presume there
are some computers that DON'T have any such problem (you have an SBS server
which hopefully is working?)? OK, zero in on the problem thru analysis.
Identify 1 or 2 computer with problems, and 2 or 3 without problems. Examine
"browstat status" and "ipconfig /all" from each computer identified. Read this
article, and linked articles, and follow instructions precisely:
<http://nitecruzr.blogspot.com/2005/05/troubleshooting-network-neighborhood.html#AskingForHelp>

And bottom post. For your own sake, as well as mine. Help me to help you.
<http://nitecruzr.blogspot.com/2005/05/how-to-post-on-usenet-and-encourage.html#TopPosting>
http://nitecruzr.blogspot.com/2005/05/how-to-post-on-usenet-and-encourage.html#TopPosting
 
Chuck said:
Peter,

Speaking from gut feel, about 50% of the problems here, that are resolved
simply, turn out to be firewall related. Maybe 25% are LSP / Winsock /
TCP/IP
corruption. The other 25% are miscellaneous.

With your symptoms, combined with the VPN involvement, a firewall becomes
more
than 50% likely. "Cannot ping by name but can ping by IP address"
suggests a
DNS server issue. DNS server issues can, again, be caused by firewall
problems.

Most common network problems:
<http://nitecruzr.blogspot.com/2005/10/irregularities-in-workgroup-visibility.html>
http://nitecruzr.blogspot.com/2005/10/irregularities-in-workgroup-visibility.html

Firewall issues:
<http://nitecruzr.blogspot.com/2005/05/your-personal-firewall-can-either-help.html>
http://nitecruzr.blogspot.com/2005/05/your-personal-firewall-can-either-help.html

Of the problems here that are NOT resolved simply (as above), you have to
do
some work. I can advise you, but you gotta do the leg work.

Network problem solving - general advice:
<http://nitecruzr.blogspot.com/2005/08/solving-network-problems-tutorial.html>
http://nitecruzr.blogspot.com/2005/08/solving-network-problems-tutorial.html

Network problem solving - Network Neighborhood issues:
<http://nitecruzr.blogspot.com/2005/05/troubleshooting-network-neighborhood.html>
http://nitecruzr.blogspot.com/2005/05/troubleshooting-network-neighborhood.html

When you say "I cannot ping", you mean your computer, right? I presume
there
are some computers that DON'T have any such problem (you have an SBS
server
which hopefully is working?)? OK, zero in on the problem thru analysis.
Identify 1 or 2 computer with problems, and 2 or 3 without problems.
Examine
"browstat status" and "ipconfig /all" from each computer identified. Read
this
article, and linked articles, and follow instructions precisely:
<http://nitecruzr.blogspot.com/2005/05/troubleshooting-network-neighborhood.html#AskingForHelp>

And bottom post. For your own sake, as well as mine. Help me to help
you.
<http://nitecruzr.blogspot.com/2005/05/how-to-post-on-usenet-and-encourage.html#TopPosting>
http://nitecruzr.blogspot.com/2005/05/how-to-post-on-usenet-and-encourage.html#TopPosting
Click to expand...

Thank you for your help.

I can not ping any computer on company's network from my home computer
through VPN by computer name, but I can ping the same computer by the IP
address.

Also the default website on Windows 2003 http:\\companyweb does not work
anymore either, I am getting 'Page Can Not be Displayed".

FYI:
Before we installed the SonicWall the Company's network was 192.168.1.1 and
we changed it to 192.168.10.1.
(the network consists of 8 computers plus the server)

So I think it is the DNS issue, but I do not know where to look or how to
fix it.
 
Thank you for your help.

I can not ping any computer on company's network from my home computer
through VPN by computer name, but I can ping the same computer by the IP
address.

Also the default website on Windows 2003 http:\\companyweb does not work
anymore either, I am getting 'Page Can Not be Displayed".

FYI:
Before we installed the SonicWall the Company's network was 192.168.1.1 and
we changed it to 192.168.10.1.
(the network consists of 8 computers plus the server)

So I think it is the DNS issue, but I do not know where to look or how to
fix it.
Click to expand...

Peter,

Well, it almost certainly is a DNS issue. Now you have to find out what the
problem is that causes the DNS issue.

Google for your symptoms, I think you'll find at least half of your cases
involve firewalls blocking the DNS packets. Of the other half, you'll find home
systems still using local or ISP DNS, even when connected to a VPN with a
corporate DNS at the other end. And you'll find LSP / Winsock / TCP/IP
corruption.

You could try putting the IP address of the Exchange server in the Hosts or
LMHosts file on your home system. If your problem is simple DNS packets being
lost / blocked, that will get around the problem. Or make sure that your DNS
server is one at the other end of the VPN tunnel, and knows the address of the
Exchange server. Or diagnose the problem. I've given you plenty of references
above.

But if I keep asking questions, and you ignore the questions, we'll never get
any answers.
 
Chuck said:
Peter,

Well, it almost certainly is a DNS issue. Now you have to find out what
the
problem is that causes the DNS issue.

Google for your symptoms, I think you'll find at least half of your cases
involve firewalls blocking the DNS packets. Of the other half, you'll
find home
systems still using local or ISP DNS, even when connected to a VPN with a
corporate DNS at the other end. And you'll find LSP / Winsock / TCP/IP
corruption.

You could try putting the IP address of the Exchange server in the Hosts
or
LMHosts file on your home system. If your problem is simple DNS packets
being
lost / blocked, that will get around the problem. Or make sure that your
DNS
server is one at the other end of the VPN tunnel, and knows the address of
the
Exchange server. Or diagnose the problem. I've given you plenty of
references
above.

But if I keep asking questions, and you ignore the questions, we'll never
get
any answers.
Click to expand...

I looked the the web sites you sugested and read all of the info, but none
of it applyies to me or at least I don't think it does or I don't know that
it does.

browstat status and ipconfig /all did not produce anything out of ordinary.

yes SBS server is working, all of the Company's internal computers connect
to it just fine, file, printing and database (MSDE) is working, with
exception of the http://companyweb .

What other answers can I provide?
 
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